一、连接代词、连接副词引导的名词性从句
1．由what, which, who/whom, whose等连接代词和when, where, why, how等连接副词引导的名词性从句在句子中可以充当主语、宾语、表语或同位语
(1)主语从句
What surprised us was her ignorance.
使我们吃惊的是她的无知。
Where we will go hasn't been decided.
我们要去哪儿还没有定下来。
When she will come is still unknown.
她何时来还不知道。
[考题印证1]
(2013·重庆高考)________ struck me most in the movie was the father's deep love for his son.
A．That B．It
C．What D．Which
解析：选C。考查主语从句。句意：这部电影最打动我的是父亲对他儿子深深的爱。“________ struck me most in the movie”为主语从句，所填词在从句中作主语，表示“什么”，故用what引导。
(2)宾语从句
The school was built on what used to be a wasteland.
